I've got a repo that I contribute to within an Organization that I administer. I'm trying to add it to careers, but it won't allow it. Is this on purpose? I don't really want to fork it to my personal account, since I won't be maintaining it from there.
If you're a public member of a Github organization, you can add projects from it.
But if your membership of the organization is not public, we won't be able to see that you're a member.
You can change your visibility from the organization admin page on Github.